They exist, but they are rare. Large tech companies have the benefit of economies of scale. For what you're looking for, you really need to find a niche player,

They exist, but they are rare. Large tech companies have the benefit of economies of scale. For what you're looking for, you really need to find a niche player, and those folks don't hire very often. OpenDental, Rogue Amoeba, Impexium, and Cronometer are a few.